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What's the difference between a bi-flow and a uni-directional? Would a uni-directional prevent flow in the opposite direction?

"The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
"Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twainhttp://www.campbellmechanical.com

Lol. It might help to have a bi flow. I went to a call after a fellow tech installed a straight cool filter/dryer backwards. I showed it to him. and he blew through it backwards and said "whats the difference"? I said blow through it at 250 psi

Lol. It might help to have a bi flow. I went to a call after a fellow tech installed a straight cool filter/dryer backwards. I showed it to him. and he blew through it backwards and said "whats the difference"? I said blow through it at 250 psi

The 250 psi is relative to atmospheric pressure. The differential pressure across the drier is almost zero. So the amount of resistance to flow should be no different than blowing through it with your mouth.
I think the difference is in the configuration of the screens and desiccants.

"The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
"Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twainhttp://www.campbellmechanical.com

The 250 psi is relative to atmospheric pressure. The differential pressure across the drier is almost zero. So the amount of resistance to flow should be no different than blowing through it with your mouth.
I think the difference is in the configuration of the screens and desiccants.

Got a walk-in freezer out there that's been running for at least 10 years with the dryer piped in backwards. I think it just doesn't filter properly being installed in the wrong direction and has no affect on flow!

Got a walk-in freezer out there that's been running for at least 10 years with the dryer piped in backwards. I think it just doesn't filter properly being installed in the wrong direction and has no affect on flow!

but this was a heat pump, so the use of a one way filter is like having no filter at all.